C. I found a bag of marbles.
This is the only sentence that contains an indefinite article. Indefinite articles are "a" and "an" for singular nouns. "some" is the indefinite article used for plural or uncountable nouns.
"the" is a definite article.
Nshaan ahuaki uwhwkoqooaoaoqoq hshd xhs
Its Mercutio! he killed mrs.Huffington